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The image displays a line graph with speed in kph on the x-axis ranging from 10 to 130 in increments of 10, and nitrogen oxide emissions in (µg/km) on the y-axis ranging from 0 to 45 in increments of 5. There are four lines representing different vehicles: diesel cars with the highest emissions starting at 40, peaking at 42 around 50 kph, decreasing to 30 at 90 kph, rising back up to 35 at 130 kph; petrol cars starting at approximately 10, rising to a peak of 15 at 50 kph, falling to 5 at 90 kph and ending at 10 at 130 kph; lorries beginning at about 35, peaking at around 38 at 50 kph, dropping to 30 at 90 kph, and concluding at 35 at 130 kph; and buses starting at approximately 25, peaking just above 30 at 50 kph, decreasing to around 20 at 90 kph, and finishing at 25 at 130 kph.
Given the complexity of the image, the above description may not be entirely accurate.
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The line graph illustrates the amount of nitrogen oxide emissions produced by four types of vehicles: buses, lorries, diesel cars, and petrol cars, measured in grams per kilometer (g/km).
Overall, it can be seen that nitrogen oxide emissions from buses and lorries fluctuate significantly depending on speed, while emissions from petrol and diesel cars remain relatively stable and lower across all speed ranges.
Looking at the graph in more detail, diesel and petrol cars emit nitrogen oxide at consistent levels of 10g/km and 5g/km, respectively, regardless of speed, ranging from 10kph to 130kph.
In contrast, buses produce significantly higher emissions. At 10kph and 130kph, their emissions peak at 40g/km and 42g/km,respectively. However, at 60kph, emissions drop to their lowest point at 26g/km.
With regard to lorries, their emissions fluctuate sharply, ranging from 17g/km to 33g/km. The lowest emission level is recorded at 90kph (17g/km), while the highest emission occurs at 10kph (33g/km).
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